The Immigrants (Muhajirun) said: Messenger of Allah! the Helpers (Ansar) got the entire reward. He said: no, so long as you pray to Allah for them and praise them. (Using translation from Abū Dāʾūd 4812)
أَنَّ الْمُهَاجِرِينَ قَالُوا يَا رَسُولَ اللهِ ذَهَبَتِ الْأَنْصَارُ بِالْأَجْرِ كُلِّهِ قَالَ لَا مَا دَعَوْتُمُ اللهَ لَهُمْ وَأَثْنَيْتُمْ عَلَيْهِمْ